Thread-severing device for knitting-machines.



1 J. LAWSON. THREAD SEVERING DEVICE FOR KNlTTlNG MACHINES.

- APPLICATION FILED JAN. 25. 91-1 v ,2935812. I Patented Feb. 11,1919

WTNassEs v INvENToR,

I I vJohn Lazy 5on at predesrniined all the threads connecting tn PATETFhiil.

llndltiffifiill, GENTRAL FALLS, RHODE ISLAND, ASSIGNOR TO HEMPI-IILLMANU i GOMPANY, A CORPORATION OF RHODE ISLAND.

rsnman-snvnninennvror. FOR KNITTING-MACHINES.

=2. may concern wn thatfli, Jenn Lawson, a. United States, residing at Q*e'itrai 1 the connty Providence State of 'vnfid'ifi have" inventedcertain new ..and .,usefjul Improvements in l lhreadfievering Devicesfor. 'i-iinittingdi/iachines, of which the foilowingis a specification;

invention relatesto improvemerits in circular antomatiostocking-imitting 'ticularly in improved means ior automatimachines,consists more pal callyseveringthe lnrittingthrcad or threads pointsduring the knitting of the stocking; Or in other words, the object ofthe present invention is :to provide knitting-machines of the classreferred to with a simple, inexpensive. and eiiicient device forautomatically severing one or more of the floating-or temporarilyinactive threads from the web while the other thread or threads areoeingknitted into the fabric device being further adapted to sever I and supply at the completion of the stocking The thread-cutting device may beemployed inconnection with," independ? of, self-acting hinder or.clamping mechanism arranged to hold the freeerni of the threads leadingfrom the respective -bobbins or cones.

In the type of knittingmachine indicated in the drawings, the saidthread-clamping and severing devices are normally disposed inside theneedle-row or the knitting-cylinder and Inennted on memhers fined to theswinging latelrring; the arrangement being such that the said de vicesare bodily movable with the latch ring, the'binder the same time hoidingthe free ends ofthe supplythreads. it may he addedthat thethread-cutting device is nor iocated inside of the needle-row andact-cent the upper oi the The arrangement and timing of the threadbinderand the severing device are such .thai; when a thread is moved out ofknitting actien, it is the same instant engaged and held by. the hinder,the cuttingnevice nn; .mediately [thereafter severing the thread fromtheweb;

Figure 1 represents an end elevation of an automatic stocking-knittingmachine show- Speeification of Letters Patent.

\ itself is pivoted at in the accompanying sheet of drawings, of themain plate 13 is provided --ing my present invention portions of themechanism being omitted. Fig. 2 is a correspondingfront side elevation;the latchllllg and portlons of the cylinder being shown in "section.Fig. 3 is a plan view of I y I Patented Feb. 11, 1919. l 4 I implicationfiled 3'anuary'25, 1931. Serial No. 604,550.

scale, the'cutting-jaws beingopen;--and Fig.

5 is a similar view, showing the jaws closed. it may be stated herethatthe present invention is. well adapted to the type ofknitting-machine illustrated and described in U; S. Patent #933,443,granted to J. D. Hemphill, September 7, 19 09, and to which referencemay bemade... That isto say, in theaccompanying drawings are indicated aframe or housing a, urrounded by a table,-

a rev'oluble knittingcylinder N, with its sinker-ring n and cap-ring G,a swinging latch-ring C provided with an extension 0Z normally supporteda standard K, spring-pressed thread-guides. al a liftingfinger ftherefor, a cam-carrying shaft 8 as. The construction and manner ofoperation' of these elements are or may be substantially the same as setforthiin the patented knitting-machine above referred to.

In the present invention or thread-cutting device, the same, except, theactuating mechanism, is or maybe detachably connected to'theswinginglatch-ring C and being bodily movable with it. The latch-ring 0to the rear standard 0 asclearly shown in Fig.1. A. bent arm or bracket0 is secured to the ring C contiguous to the pivot point, its free endportion extending toward the front and terminating within' the ringscentral space or needle-row in a substantially fiat plate B, on whichlatter is monnted binder or threadeiampingmember a capable of angularmovement, the same being employed for fielding the fioatingortemporarily inactive threads out of engagement with the needles. Thislatter device, however, forms the subject of U.-S. Patent #935,981,granted to J. D. Hemphill, October 31909.

Referring now more particularly to the accompanying drawing, one edge(the left when viewed from the front of the machine) with a steel bar orblade I) constituting the fixed cutting jaw member and havingalever-like blade themember b toproduce a shearing action upon thethread or yarn lying between the -tum jointed to a bent member h withthe action of jaws, A horizontally disposed two-arm lever'h' is pivotedat h to said bracket 0 its inner arm being jointed to a short link h, insecured .to the swinging lever -blade I). The outer member of lever h isprovided with an arcshaped slot e of suitable radius, described frompivot 0?, 'in which the upper end of the vertically ided, endwisemovable rod 0 is slidably jointed. By tion and arrangement of thecoeperating parts, it will be seen that the shearing device moves bodilywith the latch-ring wheneverthe latter is swung on its pivotc, theslotted part. e meanwhile moving while the rod e is or maybe temporarilystationary. It may be added that the cutting-j aws are kept normallyclosed, as indicated in Fig. 5, and are opened only when a thread ismoved out of knitting action. The act. of opening and closing the jawsto quickly sever the thread occurs nearly simultaneously ,orconcurrently rendering the corresponding thread inactive; the binderhowever en- I p sed around its periphery.

. and timing of these lugs bear a a tion' to the points, in the stockingwhen the knitting-threads are the lever It, as efore stated.

f inder N. v The, device,

latch-ring so as to move or swing gages the thread before it is severed.The means represented for thus opening the jaws are as follows: Q

-To the outer left end of the-main camshaft 8 is fixed a disk-likewheel-'2' having a series ofshort, suitably spaced lugs 1; dis- -It may.be EOSItIOIIlIIg irect relaknitting of the to be temporaril moved out of.knitti-ngaction. The cam-s aft and its members make one completerevolution during the production of the stocking; its movements beingeflfected in an intermlttent 'or step-by-step manner through the mediumof a pattern-chain and co-acting devices (not shown) in a wellknown way.A horizontal tilting-lever g, fulcrumed at (1 has its front or free end9 engagea'ble'with theperiphery and lugs of said Wheel 91 during therotation of the camshaft (Fig.'1) by '8 To the other or rear end oflever g is jointed a vertical rod m having itsupper end jointed to ashort-tilt-ing-lever m fulcrumed at m, in turn jointed to the lower endof the said vertically ided rod 6?, connected with st ted that thearrangement or My improved thread-cutting cated inside the circularneedle-row andhaving the shearing-blades normally positioned immediatelyabovethe non-revoluble capring G surmounting the rotary knitting-cylisconnected to the bodily with it. As thus arranged, the ends of thesevered threads extending inward from the means of this construc-.

means of the pull-spring device isv loweb are comparatively short. Thejaws of during the entire production of the stock-Y ing, except at theseveral points where the threads areto be severed. When a thread ismoved out of knitting action, by swinging its thread-guide (Z upward,the lever g is then temporarily tilted by means of its engagement withthe relatively positioned or corresponding lug ordogi of the cam-wheel2', thereby opening the aws, as indicated in Figs. land 4:, to receivethe thread the for- .ward movement of the wheel 11 immediatelythereafter operates to disengage the lever jib from the lug, at whichinstant the tension of the spring 8 depresses the free endof the leveronto the concentric rim of the'camwheel, and through the meansoperatively connecting the said lever and blade b. quickly closing-thejaws, thereby severing the thread from. the web, its other end por:

tion (which is connected to the supply cop) then being-held or confinedupon the plate B by the binder a. The binder, it may be stated, becomesoperative to thus hold the thread just before the cutting-jaws sever it.A suitable cam-like projection n formed on the under-side of plate Bserves to prevent the web from moving upward on the needles. 'Aspring-like member 0 may be em ployed for insuring proper contact of thecutting members b b. I

What I claim and desire to secure by U. S. Letters Patent is 1 Aknitting machine having in'combination a latch-ring, a cutting membermounted thereon, a cam-shaft, and means for operati'ng said cuttingmember from said camshaft.

v 2. A knitting machine having in combination a latch-ring, a cuttingmember mounted thereon, said cutting member being movable with relationto said latch-ring; a cam-shaft, and means for operating said cuttingmemher from said cam-shaft.

3. A knitting machine having in combination a latch-ring, a cuttingmember mounted thereon, a lever for'operating said cutting member, acam-shaft, and a connection from said cam-shaft to said lever.

4. A knitting-machine having in. combination a'latch-ring, a cuttingmember mounted thereon, a lever for operating said cutting member alsomounted on saidlatch-ring, a cam-shaft, a member connected to said leverlatch-ring for operating said cutting mom: her. said lever beingarc-shaped at one side of itspivot', an operating cam, and a connectionfrom sa d cam to said lever.

and adapted tobe operated by said cam 6. A knitting machine havingin'c'ombination a pivoted latch-ring, a cutting member mounted thereon,a lever pivoted on said latch-ring for operating said cutting member,said lever being provided atone side of its pivot with a curved slotdescribed approximately from the pivot of said latchring as a center, anoperating cam and a connection from said cam to said lever.

- 7. In an automatic circular knitting-maring, a cutting device, saidcutting device comprising a jaw member fixed to the latchrmgand a jawmember capable of movement with relation to the latch-ring, an arcshapedlever pivoted to the latch-ring and connected to said movable jawmember, and

a cam-actuated connection jointed to the outerend of the arc-shapedlever.

8. A knitting machine having in combination a needle-cylinder, alatch-ring adapted,

for angular movement located above said needle-cylinder, a cuttingdevice having a blade normally located within the needlerow of saidcylinder, secured to and relatively stationarywith the latch-ring, a pivoted shearing blade mounted to cooperate with the said relativelystationary blademember of the cutting device, a two-arm operating leverpivoted to and angularly movable with the latch-ring, .the inner arm ofsaid lever being connected to the said pivoted shearing blade, andintermittingly actuated means connected to the outer arm of said'pivoted operating lever, whereby the latch-rin is adapted to beoscillated on its pivot. without imparting normal cutting movement tothe pivoted shearing blade.

9. In a knitting-machine, provided with a swinging latch-ring, athread-severing device, secured to and bodily movable with thelatch-ring, including in its construction a pair of shearing jaws, meansfor opening and closing the jaws at predetermined intervals, and havingan element of said jawactuating means mounted on and movable with thelatch-ring, constructed and arranged whereby 'nected members, may bereadily swung or oscillated on its pivot through a circular thelatch-ring, with its con-' arc'i'without changing or altering theangular relation of the jaws to each other.

10. A knitting machine having in combination a latch-ring, a supportingmember secured to said latch-ring, a thread-severing A knitting machinehaving in com-- bination a latch-ring, a supporting member secured tosaid latch-ring, a thread-severing -member mounted on said supportingmember, an operating lever mounted on said supporting member, aconnection from said operating lever to member,- a cam-shaft, and aconnection from said cam-shaft to said operating lever.

12. A knitting machine having in combination a latch-ring, a supportingmember secured to said latch-ring, a thread-severing member mounted onsaid supporting member, an operating lever adapted to operate saidthread-severing member, a cam-shaft, and means. carried thereby foroperating said lever. I

13. A knitting machine having in combination a pivoted latch-ring, anoperating member mounted thereon, a lever mounted on said latch-ring foractuating said operating member, said lever being provided with a curvedslot described approximately-from the pivot of said latch-ring as acenter, and an operating connection engagin'gsaid slot.

14. A knitting machine having in comsaid thread-severing binationapivoted latch-ring, an operating.

Witnesses:

. GEO. H. REMINGTON,

Burns S. MATTESON.

